How to Restrict Site Registration to Certain Email Addresses or Domains

Hello Everyone,

I plan to run a wordpress site that can take users with specific email addresses or domains.

Ex. [email protected], [email protected]

Is there a way or a plugin to restrict site registration and access to my website to certain email address or domains only?

What happen to my users if they change email/domains later? Will they lose access to my site? Will they be required to re-register?

Will the plugin work with both a stand-alone wordpress website and multi-site?

Thank you in advance.